I've tried the #pinephone now with the latest #postmarketOS and #phosh, and it's considerably less jankey than with KDE Plasma Mobile. It's still kinda jankey, and pretty skeletal, but closer to what I would expect for a "beta" FOSS project on mobile.
also, battery life estimation still seems *really* poorly calibrated, but that's an OS or driver problem I suppose. Guess I'll do some digging